Mounting Flight Delays. Stranded Fliers. Airlines Struggle With Surging July 4 Demand.

Air passengers across the United States faced extensive flight cancellations and delays this weekend, caused by a boom in travel demand coupled with widespread staffing shortages.

From Friday through Sunday, airlines that fly within, into, or out of the United States canceled more than 1,400 flights, according to

a flight-tracking website, stranding and angering some passengers headed for long-awaited summer vacations. In…